Jig



0. E. BARBER.

HG. APPLICATION FILED FEB. 3, 1921.

Patutedl Oct. 24h, 1922.h

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To (MZw/1-0fv`nitwww @wwe/Miri." X l l i l .lle it known tlrutyl, @mwN Emlrmnn, w `citizen ort' the United titetes. and :resident ot Chicago, in tlre `eeunty or rGool; end @tate oli .ll.lin.ois,vlifwe invented u eerteinnewend useful'Improvement in digs, of fwliieli "the "following is u` tidlyCleer,leoneise, andren not deseriptioi1,V reference being liajdlftotlie zreeolnpenying drawings, :Forming e part ,of this speoilioation. j

llllyinvention `:re ttes lo jigs midfmore particularly to centering ringslmped objects :1nd objects i lnwng `circuler apertures. l

My inventieu 1 te `retain and e nter ring genrslendtlie `.like so thet nieeliin'e operetiens maybe per `lorinecl cupon the outer surteees of "the eentered olejeets, the operzitions resulting in zrcourete eoncentrieity ottlre inuoliined portions relatively vto "the exis of el eiroular aperture in `the olijeet upeu Wliielr 'theop- 1 eretions :are performed.` l

tary exis, and to provide a of the elrlss l rlllese und other objeets olffinjv iiiventicmf lllie*objectseli myinvention` are to provde u j ig' for eentering ring gears" und tlrel l like, tliie jigeoinprising' e plurality of rotat- :ilaljf onrnz'rled rolls udapted toffrotete in unison :dient-their rotary mies and `lian/ing surt'eees edepted tofengaigie and positiony the inner surfaces oit the ring` gears und thelil'ce j so that the axes ol. the `eel'itered objeetswill i lee coincident with ereo'mmoi'i celtrelvaxis et the rolls; to provide e jig1 oit the el described e )nip1"ising` fr. plurality oi ee'een.- trieelly journellled rrfylin(lere,`` eeel cylinder having .independent ineens tor singularly ed# justine` its eentrzlrl, exis relatively toits rodescribed @olieprisilly` pll'irelity et eyliirders und ineens e uetingwitlr the eylimlers .tor i looking the e tion normal to their `dires.

will be more clearly set 'lortli es thotollow# infn' deseription j )rogressesj referentie being lied to tl'ie eetr'unpenying; drawings,"wherein,

4Figure 1 is zt ventiel*longitudiniil see# tiem tlirI/ougli u. jig "embodying the novel fea'tturesof'iny invention. I i l "Figure 2 is e plan! elevutionjtfjf the `lfifgures #Elend e ere seetionstlren on lines und" ll`4lj respectively, "of Figure l lrfiolrinjg in the direetiono the arrows `onteinpletes at g adapted i itererl. objet-ts in e ."zposi f .unprev i llfigvures 5 enc are sections teken on lines o-o'nnd` 6*@ respectively, ofFigure 2 .looking 11.` the direction of the lcirrovvs.

lllgure is u. sect-ion teken online 7-7 of Figure l.

Figure 8 is'ziy detail view of e pin used in eoluieetlon 'with nojlfelloekingIneens, and

1H rgure l 9 1s e detail View of l` center which muy berempleyed `when the jig is to be secured `between two opposing centers of a. gear cutting' muelline or thel like.

ySimilar characters of referente designate similar partethroughouttlieseverztl ifiews.

lntlie: drawingsl lieve illustrated u emlaodylng the novel `features of inyinven! tion. The jig is particularly adapted to retain and" Center e plunlity ol.3 ring" gear blanks inwliieli teeth are to `loelioliloed and `lies means whereby it tney lierotetably rneunted in Inonly noter.

i Referring to Figure l, the reference eliereeters lOand ll eaeli designate a. eireulur plate forming tt partei my improved jig. `The pletesl() and upperend lower ends, respectively/,lof tl're jiu', the axes of the plates being coincident. yllhe p lrtesweresecurely held in `spaced reletien relatively to eheh other by e plurality el. reds 12 which? are provided with shoulders ll rige-inst which theinnerlfaees oletlie` plates rest, (Figure 5). Euch rod 1Q `lisis a1 reduced portion l-` tlireu-ded into the plete ll and 'e reduced portion I5 projeotingl tlirougli one of :i plu lility of rjiertures i6 provided in tlie plate 10. By means el 'zrnrit 16 tlireeded upon each redue'edyportion l5, the Jlateflll is rigidlyV seouredto the several ro s. The plates l() und llyendm' s 1Q eenstitute tire 4:trarne oft' my A' jig, l'the treme serviugto journal :r pljrllle` ity eitglollonf eylindersl, presently trrbeeserbed. j

l 'A' liereinleforesetfortll, the is adapted tonte retsttbly mounted in e machine er thegear cutting type. For' this. purpose, .theplate 1i s previded with an sperm-e1@ Wliol'ifsnugly lits the eylindrieel'endiQOot e tapered center plug 2l. The plug 2l slieWn inserted into the tapered bore of e mendremz which is typical of maehnesem-- ll ere `,disposed at the which may be driven in the usual manner. The axes oil the plug 21 and the plates 10 and 11 are coincident. The frame comprising the plates 10 and 11 and the rods 12, is rotated about this common axis by means comprising a face plate 2st threaded upon the mandrelf22, the plate 11 ot the 'trame beingsecured to the face plate by bolts 25. It is apparent that the axis ot rotation of the mandrel 22 is also the axis of rotation oit the frame and that the jig may be rotated continuously or advanced step b y step in a manner and bymeans well known to those skilled .in the art. The aforementioned hollow cylinders 18 are interposed between the plates l0 and 11 and each is eccentrically mounted relatively to its central. axis upon one of a plurality ci shafts 26. Each shaft 28 is disposed parallel to the axis of rotation of the tramevand Ihas its ends journalled in the plates 10 and 11*` the upper end of each shal't .projecting through the plate '10. A. pinion 27 is rigidly secured to the projecting end of each shaft 2G Yt'or a purpose which will presently appear.

'As shown in Figure 2, each of the shafts 26 is equidistantly spaced from the others and from the axis of rotation of the frame.

It is readily understood that if the cylin ders 18 besecured to the shafts 26 and if the central axes of the cylinders be adjusted to occupy identical positions respectively, relatively to their rotary axes andto the axis of rotation of the frame, the several cylinders may be rotated in unison about their several rotary axes so as to accurately position a ring-shaped object disposed around them so that the axis of the object and the axis ot rotation ofthe frame and mandrel will be coincident.

To secure cylinders 18 to the shafts 26 and to provide means whereby the central axis of each cylinder may be angularly adjusted about its rotary axis, one of a pluralityof levers 28 is rigidly secured to each shaft 26 by a set screw29 and a taper pin 30. The levers 28 are disposed within` the hollow cylinders 18. In assembling this device, the lever 28 is first properly positioned upon'the shaft 26 and secured thereto by the set screw 29 ywhich may be manipulated. through an aperture 31 provided in the cylindrical wall of the cylinder. The lever and shaft are then drilled and reamed for the taper pin. This construction insures rigidity and accuracy when theljig is cmployed in work of the character described. :Disposedv at right angles to the shafts' are a-plurality 'of cap'screws 32 one of the cap screws being adjustably threaded into each of the levers 28 at apoint intermediate its ends, {Figure 4)'. n

The threadedl end of each cap screw 32 bearsagainsta lug 133 projecting inwardly from thepwallof 'itsfassociated cylinder thus `lever 28.

screws 32 and the set screws 3l, the central @atenas permitting the centra-l axis ol each eyliu der to be rotated in a counter-clockwise direction about the rotary axis of the cylinder when the cap screw is advanced. Likewise the central axis may be rotated in a clockwise direction by a headless set screw 3ft threaded into the wall ol' the cylinder and bearing upon the 'free end of the associated By manipulation ol'Y (luf cap axes oit the cylinders may be accurately adjusted. relatively to their respective rota ry axes and to the axis of rotation of the lrzune. 1When once properly adjusted to center iu a manner hereinbefore described, a ring shaped object disposed around them. the cylinders, if rotated in unison`l will, ol? course. center' all ring-shaped objects disposed around them which have apertures olf dimensions falling within the capacity of the jig.

To rotate the cylinders in unison, l pro vide a gear 35 rotatably journaled upou a pin 36 which is secured to the plaie 1U. The gear 35 meshes with the aforementioned pinions 27. The operator may rotate the gear 35 by means of a pair ot handles 37 secured to the gear for this purpose. The `gear may be locked in any desired position by a nut 38 threaded upon the pin 36, the nut 38 being adapted to hold the gear tightly against the outer face of the plate 10.

As illustrated in Figures 1 and 2. a plurality of ring gear blanks Ll0 may be disposed around the cylinders 18 and centered thereby. The lowermost `ear blank rests against outwardly extending flanges 4l formed integrally with the cylinders Y1.8 at the bottom ends thereof. This is to insure the proper positioning of the blanks in planes normal to the axis of rotation of the frame.

To securely lock the gear blanks l0 in position during the bobbing operation. l pro vide circuln'lfcrential grooves l2 cui: 'into the cylindrical Afaces ol the cylinders at their upper ends (Figures l and 7). A, pluralil \l of U-shaped plates i3 :ire inserted into tlir grooves 42 which prevent longitudinal dis placement ot the plates. set screw l-fl is adjustably threaded into each plate 4.3 and may be advanced. to bear upon the upper most gear blank, as shown in Figure l. rllic gear blanks will then be iirml y secured between the several flanges 4l and the sei screws 44.

Il it is desired to place a lesser number of blanks upon the jies, pins may be inter'- posed between the set screws 4A: and the uppermost gear blank, (Figure. 8). The pins 4 5 are provided with rounded ends adapted to co-act with cup pointed sel screws. Where the jig is employed in operations upon differently sized gear blanks, and upon varying numbers of. gear blanks, u

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nii-sensa number `ot pins sinfrilar to the pins `may be employed to meet the `partieular conditions.

lllhile ll. have illustrated my improved jig as being secured to the face, plate et a suitable machine, it may also `be rotatably mounted between opposing centers, il so desired. Forthis purpose, the pin 36 is provided with a conical recess 417 `in `its otter end, the :recess being adapted to cci-act lwith one or' tivo opposing centers in any suitable machine.` it pin "455', `lliinnre 9, may inserted into the apertures 19 ofthe plate ll and; secured thereto by shoulder t9 formed upon `the pin, `and a nut 514D tllireadedupon the pin. lconical recess l formed in one eind o the pin is adapted to be engaged by the otlirer' center oit the pair oli centers.

Alt() ln the operation oat the device, the jig is properly placed in a machine olf the cli-aracter des 'i-bed, the blanks having been loosely arranged upon the jigit the machine is not j plate type. .t the machine is ot the faceplate type, the blanks may be placed `upon the aili'ter it secured totlfre taceplatc. Theblanlts are then hield in a positionin 'which the blank adjacent the flanges lll is held against the iianges. The operator then rotates the gear 35 by means oli the handles 37, the gear being rotated in a cloch- Wise direction (Figure 2). The cylinders will properly center the gear blanks and they may be locked in place by the set screws tai.. The nut 38 may be adjusted to lock the cylinders in their adjusted positions. The

blanks are then properly positioned and secured for the bobbing operation.

The particular ttorm of j ig which above described is adapted to center objects having circular apertures. However, it is apparent that the novel 'features oi my invention are not limited to this class ot jig, but may be embodied in a adapted to center cylindri cal objects by contacting the cylindrical surfaces of the objects. ln such a jig, the

object would be interposed between the sevo 'al cylinders.

lllhile l have thus described the details of one form oil my invention, it is to be understood that I am not limited to these details except by the scope oli' the appended claims. lll'hat l claim is new and desire toy secure by United States Letters Patent, iszl. A. jig comprising a trame, a ,plurality ot cylinders eccentrically journalled in the traine` the rotary ases ot the cylinders being equidistantly spaced from eachother and from a. common central axis. and n'ieans tor rotating the cylinders about their respective rotary axes in unison.

2. A comprising a frame, a plurality oit cylinders eccentrically journalcd in the trame, the rotary axes of the cylinders being equidistantly spaced from each other and trom a common central airis, means for independently adjusting the normal axis of surif'aces ot the `rolls being adapted to posi` tion a circularly apertured object disposed around thesereral rolls so that the axis of the aperture and the common central axis oit the rolls ivill becoilncident.

A jig comprising a frame, a plurality ot rolllfs eccentricall'y journalled in the frame, the rotary axis oli the rolls being spaced equi# distantly from each other and from aconiA` mon central axis, means lor independently adjusting each roll aneula-rly about its rdl tary axis, `and means lor rotating the rolls about their rotary axes inuiiison, the surfaces oi the rolls beine#` adapted to position a circularly aperturedf object disposed around tl `e several rollsfso that the ams ot the apen` ture andthecommon centra-l axis ot the rolls will be coincident.

5. A comprising' a rotatably mounted frame, a plurality of cylinders journalled in the frame each cylinder being eccentrically journalled relatively to its central axis, the rotary axes of the cylinders being equidistantly spaced from each other and from the axis of rotation of the frame, and means for rotating the cylinders about their respective rotary axes in unison.

6. A jig comprising a rotatably mounted trame, a plurality of cylinders j ournalled in the frame, cach cylinder being` eccentrically journalled relatively to its central axis, the rotary axes of the cylinders heilig equidistantly spaced from each other and from the axis of rotation of the iframe, means for independently adjusting the central axis of each cylinder relatively to its rotary axis, and means for rotating the cylinders about their rotary axes in unison.

7. A jig comprising a frame adapted to be rotatably mounted in a gear cutting machine or the like, a plurality of shafts journalled in the traine and disposed parallel to the axis of rotation of the trame, the shafts being equidistantly spaced. `from each other and from the axis oit rotation oit the tramo, a cylinder eccentrically mounted upon. each shaft, means disposed Within each cylinder for adjusting the central axis oi the cylinder relatively to its rotary axis, a pinion rigidly secured to each shaft and means for rotating the pinions in unison.

8. AL jig comprising a fra-ine, a plurality of' cylinders rotatably journalled in the frame,

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from each other and from a common central axis, means for rotating the cylinders about their rotary axes in unison, the cylinders being adapted to position acircularly apertured obj ect disposed around theseveral cylinders so that the axis of the aperture and the common central axis will be coincident, and means for preventing longitudinal displacement of the object.

9. In a jig for centering circularly apertured objects, the combination With a plurality ot rollers, of means coacting with the rollers for locking the objects against longitudinal displacement when the objects are disposed around the rollers.

10. ln a comprising a plurality of rolls for vcentering a circularly apertured object, each roll having a circumferential groove at one end andan outwardly extending iange at the' other end, a plate adapted to coact with the groove, vand means carried by the plate for locking the object against the flange. l

11. A jig comprising a trame at least three cylinders eccentrically journalled in theframe, the rotary axes of the cylindersbeing equidistantly spaced from a common central axis, a common actuating device for adjusting the normal axes of the several cylinders relatively to their respective rotary axes, and means for adjusting the normal axis of each cylinder with respect to its rotary axis independently of the common actuating means aforesaid.

12. A 'ig comprising a frame, a plurality of cylinders eccentrically journalled in the frame, the rotary axes of said cylinders being equidistantly spaced from each other and from a common central axis, pinions fixed to said cylinders and disposed concentrically Withthe rotary axes thereof, a mas* ter gear meshing With all ot said pinions, and means for operating said master gear to rotate said cylinders around their rotary axes in unison.

l'n Witness whereof, I hereunto subscribe my name this 19th day of January, 1921.

ORREN E. BARBER.

litnesses ARTHUR W. CARLsoN, ANDREW F. VVINTERCORN. 

